ERROR - 400

A 400 Bad Request error happens when a server cannot understand a request that's been made of it. It's called a 400 error because that's the HTTP status code that the web server uses to describe that kind of error.

A 400 Bad Request error can happen because there's a simple error in the request. Perhaps you've mistyped a URL and the server can't return a 404 Error, for some reason. Or maybe your web browser is trying to use an expired or invalid cookie. Some servers that are not configured properly can also throw 400 errors instead of more helpful errors in some situations. For example, when you try to upload a file that's too big to some sites, you might get a 400 error instead of an error letting you know about the maximum file size.